Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf...75g&link_type=abstract
SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli
Astronomy and Astrophysics
Astrophysics
Scientific paper
The legal time scale UTC (Universal Time Coordinated) is derived from TAI (Temps Atomique International) by the insertion of leap seconds in order to maintain UTC to less than 0.9 s of the time scale based on the Earth's rotation UT1, i.e. |UT1-UTC| < 0.9 s. This system introduced in 1972 is working well and satisfies most of the users requiring accurate timing. Recently, however, several communities such as telecommunications and navigation systems arguing that the occasional insertion of leap seconds is at the origin of main difficulties in several navigation and telecommunication systems, proposed a revision of the UTC definition. The revision aims to eliminate leap seconds in order to have a continuous time scale. Discussions at national and international levels have been in progress on this subject for several years. The objective of the paper is to present the situation concerning the possibility of redefining UTC, the alternative choices available beyond the status quo, the content of discussions which took place and the status of the overall process.
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